Advanced treatment by chemical oxidation of pulp and paper effluent from a plant manufacturing hardboard from waste paper.
This study attempts to evaluate the applicability of chemical oxidation processes to polish biologically treated effluent of a plant manufacturing hardboard from waste paper to comply with the discharge limit of 120 mg l(-1) chemical oxygen demand (COD). In the first step, a chemically assisted settling was applied. The optimum results were obtained with alum plus lime with the alum dose of 200 mg l(-1). In the second step, chemically assisted settling effluent was fed into an activated sludge system and over 80% COD removal was achieved. In the last step of the experimental study, a series of ozone oxidation and Fenton oxidation methods were tested to remove residual COD. Ozone oxidation provided 80% COD removal. An ozone dose of 40 mg min(-1) with a reaction time of two hours was found to be optimum. Catalytic ozonation by using ferric iron, as well as high pH ozonation, Fenton process and H2O2/O3 oxidation did not prove to be more efficient than plain ozonation under these study conditions.
Tünay
O
O
Department of Environmental Engineering, Civil Engineering Faculty, Istanbul Technical University, 34469, Maslak, Istanbul, Turkey.
Erdeml
E
E
Kabdaşli
I
I
Olmez
T
T
D002384:Catalysis; D006861:Hydrogen Peroxide / Q000737:chemistry; D007220:Industrial Waste; D007501:Iron / Q000737:chemistry; D010084:Oxidation-Reduction; D010126:Ozone / Q000737:chemistry; D010209:Paper; D015203:Reproducibility of Results; D012722:Sewage / Q000737:chemistry; D014865:Waste Disposal, Fluid / Q000379:methods*
C045076:Fenton's reagent; D007220:Industrial Waste; D012722:Sewage; D010126:Ozone; D006861:Hydrogen Peroxide; D007501:Iron